Well, I was waiting for it, and now Shimano just announced it a couple hours ago.

New XTR with 10sp double and triple cranks, new hydraulic brakes, and a new tubeless wheel system.

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It looks like Shimano will pursue both 2x10 drivetrains for XC and 3x10 for “trail” riding. The new crank design seems understated compared to previous offerings. Cassettes will be in either 11-34 or 11-36 offerings, with an updated “Shadow-type” rear derailleur. Pretty hot.